Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b8c9b6e484775b…

MALICIOUS

PDF

66.9 KB Created: 2020-12-27 16:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5dec5e40e0fc0cc5691615073317afe8 SHA-1: 1f8a51d89cb4439fc331bc56d12aa61df21c809a SHA-256: 75b8c9b6e484775bc9cab50a7e799ecd72307a0314076ba122eac0c7aa6490c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/strik?utm_term=citizen+of+rome+dynasty+ascendant+tips PDF link annotation
    • https://cdn.sqhk.co/rinilafexowi/hithagV/87200085870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fbc8347a7bb9.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/igJggwI/alarm_clock_app_that_plays_amazon_music.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/pigiwojoma.pdfIn PDF document text
    • https://cdn.sqhk.co/nimawabej/cFijIhb/kpop_stores_hiring_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f8aca3447ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8d5c95ad1e1.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/Tf1S0jf/game_mirip_summoners_war_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_5fd18d8f22c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_5faa083d31710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fbaea37416da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f922ed70310d.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/U0P20c3/linear_equations_examples_algebra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 5324 bytes
SHA-256: c9b7a7443fcd9689db106e9cde842e5c7a837b5065e139c136f0218fc9221b19
font_01_sfnt_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 10624 bytes
SHA-256: 102a5c2d3461326c563c416621310baad69d350af550ceee3243abe05ca6d7cb

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